Greetings, I would appreciate a little guidance from those of you who have experienced problems with the Dodge Durango Sport 4 WD 2002 4.7 engine/ 230,000 miles or similar.
Problem/ Engine will not idle below 1400 RPM

Recent Activity;
.Replaced Valve Lashers (lifters) due to tapping
.Was able to view cracked housing in two (2) fuel injectors
. Replaced ALL Fuel Injectors / OE style exact replacement
. Disabled A/C system due to need of replacing A/C compressor (later this month) ulled fuse
. Assembled engine
. Tested fuel pressure and for leaks / all is good
. Wiring is good
. Started engine
. Idle went to 1800 RPM then settled at 1400 RPM
. Replaced Throttle Position Sensor (TPS)
. TPS not issue
. Checked accelerator stop tab position on Throat Body Stop Plate
. Accelerator is positioned at the stop plate where it should be for idling
. Idle will not go below 1400 RPM
. I have the full service manual and there is no mention of any issues with the PCM or other device requiring attention after fuel injector change out
. Also, disconnected battery ground and let sit overnight then reconnected to start engine; high idle exists
. Please let me know what other information you may need as I may have already run that check
Questions:
. Is someone able to inform me what I may have missed?
. DO the fuel injectors require further testing?
. Does the computer require updated software because I replaced ALL Fuel Injectors?
. Your input would be greatly appreciated and thank you in advance for sharing your knowledge.

Leebar

 

You likely have an air leak somewhere. To keep the O2's happy, the computer can only compensate for the extra air by adding extra fuel. Doing that is the equivalent of holding your foot down a tad, so you get what you see.

 

You are correct, JeeperDon. Last evening I found, by mistake grabbing the hose, the PCV hose had come loose from the intake manifold rear connection by the firewall. This is a very tight space, easy to miss and hard to see.
I thank you for your suggestion.
Best regards,
Leebar

 

i have a 2004 dodge dakota 4.7 and recently changed plugs. upon completion my idle went from 950 rpm to 1200rpm. i went back over what i did to gain access to the plugs. i had to remove coil packs ,hence i had to disconnect ac/line brackets and i had to lift pcv plastic line that comes from the oil fill cannister up to remove a coil pack. Un knowingly there is a rubber elbow on the back of the intake that attaches to plastic pcv line and it cracked and came off. it connects the pcv line along motor on passengers side to back of the intake. i had to lay on top of the motor my right hand on one side of intake and my left hand on left side of intake. that is the only way i could put a new piece of rubber elbow back on to plastic line then the other end on to back of air intake. A real tight spot. just bought a 8 in hose with a elbow from auto store and trim to size. Idle went from 1200rpm to 650rpm which i believe is spec for truck.